Look at any pay stub and you'll see two deductions that never go away: Social Security and Medicare. Together they're called FICA taxes — and they're one of the most misunderstood parts of the American payroll system. Here's exactly what they are, how they're calculated, and what they pay for.
What does FICA stand for?
FICA stands for the Federal Insurance Contributions Act, the 1935 law that created the payroll tax funding Social Security. Medicare was added in 1965. Today, FICA refers to both taxes collectively.
Unlike federal income tax — which varies based on your income, filing status, and deductions — FICA taxes are calculated as a flat percentage of your wages, with no complex brackets to navigate.
The two FICA taxes
Your total FICA burden as an employee is 7.65% — but your employer pays another 7.65% on your behalf directly to the IRS. That means the government collects 15.3% of your wages for FICA, it's just split between you and your employer.
Social Security in detail
The Social Security tax (technically called the Old-Age, Survivors, and Disability Insurance tax, or OASDI) funds retirement benefits, disability benefits, and survivor benefits paid to workers and their families.
The wage base limit
Social Security only applies to wages up to a certain amount each year — called the wage base limit. For 2026, that limit is $176,100. Once your earnings in a year exceed that amount, Social Security withholding stops completely for the rest of the year.
Example: If you earn $200,000 in 2026, you'll pay Social Security tax on the first $176,100 — a total of $10,918.20 — and nothing on the remaining $23,900.
The wage base increases most years to keep up with wage growth in the economy. In 2020 it was $137,700; by 2026 it had grown to $176,100.
Medicare in detail
The Medicare tax (also called the Hospital Insurance tax) funds Medicare Part A, which covers hospital stays, skilled nursing, and some home health services. Unlike Social Security, Medicare has no wage cap — the 1.45% applies to every dollar you earn.
Additional Medicare Tax for high earners
The Affordable Care Act added an Additional Medicare Tax of 0.9% on wages above certain thresholds. This extra 0.9% is only paid by the employee — your employer does not match it.
| Filing Status | Threshold | Extra Rate |
|---|---|---|
| Single / Head of Household | $200,000 | +0.9% |
| Married Filing Jointly | $250,000 | +0.9% |
| Married Filing Separately | $125,000 | +0.9% |
Your employer is required to withhold this additional 0.9% once your wages exceed $200,000 in a calendar year, regardless of your filing status. If you're married and your combined income exceeds $250,000 but neither spouse earns more than $200,000 individually, you may owe the additional tax when you file — it won't have been withheld automatically.
A real-world calculation example
Over 26 bi-weekly pay periods, this worker would pay $5,737.68 in FICA taxes for the year — and their employer would pay an equal amount on top of that.
Self-employed workers pay double
If you're self-employed — a freelancer, independent contractor, or sole proprietor — there's no employer to split FICA with. You pay both halves: the full 15.3% (12.4% Social Security + 2.9% Medicare) on your net self-employment income.
This is called the self-employment tax (SE tax), and it's paid when you file your annual tax return (usually via Schedule SE). You pay it on 92.35% of your net earnings — the IRS applies this adjustment to account for the fact that employees' wages are reduced by the employer's share before the employee's portion is calculated.
The silver lining: self-employed workers can deduct the employer-equivalent half of their SE tax (50%) as an adjustment to income on their federal return, which partially offsets the burden.
Our calculator handles both W-2 and 1099/freelance FICA automatically.
FICA vs. federal income tax — key differences
| Feature | FICA | Federal Income Tax |
|---|---|---|
| Rate | Flat (6.2% + 1.45%) | Progressive (10%–37%) |
| Employer match | Yes (7.65%) | No |
| Wage cap | Yes (SS only, $176,100) | No |
| Affected by deductions | No | Yes (pre-tax deductions reduce taxable income) |
| W-4 elections apply | No | Yes |
| Purpose | Social Security & Medicare trust funds | General federal spending |
Can FICA be reduced or avoided?
For most employees, the answer is effectively no. FICA applies to wages from the first dollar earned, and pre-tax deductions like 401(k) contributions or health insurance premiums do not reduce your FICA base (only your income tax base).
A few limited exceptions exist: certain student workers, some religious group members who have opted out, and non-resident aliens on certain visa types may be exempt. For the vast majority of American workers, FICA is a mandatory, non-negotiable withholding on every paycheck.
What does your FICA actually buy you?
It's not just a tax — it's a contribution to benefits you may eventually claim:
- Social Security retirement benefits: Your benefit amount is based on your 35 highest-earning years. The more you pay in, the higher your eventual benefit (up to program maximums).
- Disability insurance: If you become disabled before retirement age, Social Security Disability Insurance (SSDI) may replace a portion of your income.
- Survivor benefits: Your spouse and dependent children may receive Social Security benefits if you die while still working.
- Medicare Part A: After working for at least 10 years (40 quarters), you'll qualify for premium-free Medicare Part A hospital coverage at age 65.